HITACHI HD74AC373

HD74AC373/HD74ACT373
Octal Transparent Latch with 3-State Output
Description Diagram
The HD74AC373/HD74ACT373 consists of eight latches with 3-state outputs from bus organized system
applications. The flip-flops appear transparent to the data when Latch Enable (LE) is High. When LE is
Low, the data that meets the setup time is latched. Data appears on the bus when the Output Enable (OE) is
Low. When OE is High, the bus output is in the high impedance state.
Features
•
•
•
•
Eight Latches in a Single Package
3-State Outputs for Bus Interfacing
Outputs Source/Sink 24 mA
HD74AC373 has TTL-Compatible Inputs
HD74AC373/HD74ACT373
Pin Arrangement
OE 1
20 VCC
O0 2
19 O7
D0 3
18 D7
D1 4
17 D6
O1 5
16 O6
O2 6
15 O5
D2 7
14 D5
D3 8
13 D4
O3 9
12 O4
Gnd 10
11 LE
(Top view)
Logic Symbol
D0 D1 D2 D3 D4 D5 D6 D7
LE
OE
O0 O1 O2 O3 O4 O5 O6 O7
Pin Names
D0 – D7
LE
OE
O0 – O7
2
Data Inputs
Latch Enable Input
Output Enable Input
3-State Latch Outputs
HD74AC373/HD74ACT373
Truth Table
Inputs
Outputs
OE
LE
Dn
On
H
X
X
Z
L
H
L
L
L
H
H
H
L
L
X
O0
H
L
Z
X
O0
:
:
:
:
:
High Voltage Level
Low Voltage Level
High Impedance
Immaterial
Previous O 0 before Low-to-High Transition of Clock
Functional Description
The HD74AC373/HD74ACT373 contains eight D-type latches with 3-state standard outputs. When the
Latch Enable (LE) input is High, data on the Dn inputs enters the latches. In this condition the latches are
transparent, i.e., a latch output will change state each time its D input changes. When LE is Low, the
latches store the information that was present on the D inputs setup time proceding the High-to-Low
transition of LE. The 3-state standard outputs are controlled by the Output Enable (OE) input. When OE is
Low, the standard outputs are in the 2-state mode. When OE is High, the standard outputs are in the high
impedance mode but this does not interfere with entering new data into the latches.
Logic Diagram
D0
D1
D
D2
D
G
O
D3
D
G
O
D4
D
G
O
D5
D
G
O
D6
D
G
O
D7
D
G
O
D
G
O
G
O
LE
OE
O0
O1
O2
O3
O4
O5
O6
O7
Please note that this diagram is provided only for the understanding of logic operations and should not be
used to estimate propagation delays.
3
HD74AC373/HD74ACT373
DC Characteristics (unless otherwise specified)
Item
Symbol
Max
Unit
Condition
Maximum quiescent supply current
I CC
80
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = Worst case
Maximum quiescent supply current
I CC
8.0
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = 25°C
Maximum ICC/input (HD74ACT373)
I CCT
1.5
mA
VIN = VCC – 2.1 V, VCC = 5.5 V,
Ta = Worst case
AC Characteristics: HD74AC373
Ta = +25°C
CL = 50 pF
Ta = –40°C to +85°C
CL = 50 pF
Item
Symbol
VCC (V)*1
Min
Typ
Max
Min
Max
Unit
Propagation delay
t PLH
3.3
1.0
10.0
13.5
1.0
15.0
ns
5.0
1.0
7.0
9.5
1.0
10.5
3.3
1.0
9.5
13.0
1.0
14.5
5.0
1.0
7.0
9.5
1.0
10.5
3.3
1.0
10.0
13.5
1.0
15.0
5.0
1.0
7.5
9.5
1.0
10.5
3.3
1.0
9.5
12.5
1.0
14.0
5.0
1.0
7.0
9.5
1.0
10.5
3.3
1.0
9.0
11.5
1.0
13.5
5.0
1.0
7.0
8.5
1.0
9.5
3.3
1.0
8.5
11.5
1.0
13.0
5.0
1.0
6.5
8.5
1.0
9.5
3.3
1.0
10.0
12.5
1.0
14.5
5.0
1.0
8.0
11.0
1.0
12.5
3.3
1.0
8.0
11.5
1.0
12.5
5.0
1.0
6.5
8.5
1.0
10.0
Dn to O n
Propagation delay
t PHL
Dn to O n
Propagation delay
t PLH
LE to O n
Propagation delay
t PHL
LE to O n
Output enable time
Output enable time
Output disable time
Output disable time
Note:
4
t PZH
t PZL
t PHZ
t PLZ
1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
ns
ns
ns
ns
ns
ns
ns
HD74AC373/HD74ACT373
AC Characteristics: HD74AC373
Ta = +25°C
CL = 50 pF
Ta = –40°C to +85°C
CL = 50 pF
Item
Symbol
VCC (V)*1
Min
Typ
Max
Min
Max
Unit
Propagation delay
Dn to O n
t PLH
5.0
1.0
8.5
10.0
1.0
11.5
ns
Propagation delay
Dn to O n
t PHL
5.0
1.0
8.0
10.0
1.0
11.5
ns
Propagation delay
LE to O n
t PLH
5.0
1.0
8.5
11.0
1.0
11.5
ns
Propagation delay
LE to O n
t PHL
5.0
1.0
8.0
10.0
1.0
11.5
ns
Output enable time
t PZH
5.0
1.0
8.0
9.5
1.0
10.5
ns
Output enable time
t PZL
5.0
1.0
7.5
9.0
1.0
10.5
ns
Output disable time
t PHZ
5.0
1.0
9.0
11.0
1.0
12.5
ns
Output disable time
t PLZ
5.0
1.0
7.5
8.5
1.0
10.0
ns
Note:
1. Voltage Range 5.0 is 5.0 V ± 0.5 V
AC Operating Requirements: HD74AC373
Ta = –40°C
to +85°C
CL = 50 pF
Ta = +25°C
CL = 50 pF
Item
Symbol
VCC (V)*1 Typ
Guaranteed Minimum
Unit
Setup time, HIGH or LOW
t su
3.3
3.5
5.5
6.0
ns
5.0
2.0
4.0
4.5
3.3
–3.0
0.0
0.0
5.0
–1.5
0.0
0.0
3.3
4.0
5.5
6.0
5.0
2.0
4.0
4.5
Dn to LE
Hold time, HIGH or LOW
th
Dn to LE
LE pulse width, HIGH
Note:
tw
ns
ns
1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
5
HD74AC373/HD74ACT373
AC Operating Requirements: HD74ACT373
Ta = –40°C
to +85°C
CL = 50 pF
Ta = +25°C
CL = 50 pF
Item
Symbol
VCC (V)*1 Typ
Guaranteed Minimum
Unit
Setup time, HIGH or LOW
Dn to LE
t su
5.0
3.0
7.0
8.0
ns
Hold time, HIGH or LOW
Dn to LE
th
5.0
0.0
0.0
1.0
ns
LE pulse width, HIGH
tw
5.0
2.0
7.0
8.0
ns
Note:
1. Voltage Range 5.0 is 5.0 V ± 0.5 V
Capacitance
Item
Symbol
Typ
Unit
Condition
Input capacitance
CIN
4.5
pF
VCC = 5.5 V
Power dissipation capacitance
CPD
40.0
pF
VCC = 5.0 V
6
Unit: mm
24.50
25.40 Max
6.30
11
1
7.00 Max
20
10
1.30
2.54 ± 0.25
0.48 ± 0.10
0.51 Min
1.27 Max
2.54 Min 5.08 Max
0.89
7.62
+ 0.11
0.25 – 0.05
0° – 15°
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
DP-20N
—
Conforms
1.26 g
Unit: mm
12.6
13 Max
11
1
10
1.27
*0.42 ± 0.08
0.40 ± 0.06
0.10 ± 0.10
0.80 Max
*0.22 ± 0.05
0.20 ± 0.04
2.20 Max
5.5
20
0.20
7.80 +– 0.30
1.15
0° – 8°
0.70 ± 0.20
0.15
0.12 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
FP-20DA
—
Conforms
0.31 g
Unit: mm
12.8
13.2 Max
11
1
10
0.20 ± 0.10
0.935 Max
1.27
*0.42 ± 0.08
0.40 ± 0.06
*0.27 ± 0.05
0.25 ± 0.04
2.65 Max
7.50
20
0.25
10.40 +– 0.40
1.45
0° – 8°
0.57
0.70 +– 0.30
0.15
0.12 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
FP-20DB
Conforms
—
0.52 g
Unit: mm
6.50
6.80 Max
11
1
10
4.40
20
0.65
*0.22+0.08
–0.07
0.20 ± 0.06
1.0
0.13 M
6.40 ± 0.20
*Dimension including the plating thickness
Base material dimension
0.07 +0.03
–0.04
0.10
*0.17 ± 0.05
0.15 ± 0.04
1.10 Max
0.65 Max
0° – 8°
0.50 ± 0.10
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
TTP-20DA
—
—
0.07 g
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4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
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